Sealing the joints of sectional concrete pipe.



J. C. MITCHELL.

SBALING THE JOINTS OF SECIONAL CONCRETE RIPE APPLICATION FILED MAR. 15.1909 Patented Mar'. 4, 1913.

2 sHBETsjsHEET 1.

J. C. MITCHELL. SBALING THE JOINTS 0F SECTIONAL CONCRETE HPB.

APPLIG'IIONV FILED UL'AR l5, M909. A 1,054,857. Patented Mal. LL,l 1913;

2 SHEETS-'SHEET 2" QUE, y .A www1. Simmel/V606,

JHN C. METCHELL, GF NEWPORT NEWS, VIRGINIIA. l

SALING- THE JOITS F SECTIONAL CGNCRETE PIPE,

' Specieetion fsf-Lettere eaten@ Patented Mar. 4, 1913.

Application filed Merch l5, i999. ilaria! No. 83,344.

'To all whom, t may concern:

Be it known that l, .loner @-Mrrcnnnn, n citizen of the United States,residing et Newport News, county ci: Werwicig land State ot Virginia,have invented certain new and useful improvements in Seeling the Jointsot' Sectional Concrete Pipe, of lvvl'iich the following is n, full,clear, end exact description.

This invention relates to sectional ooncrete pipe, more particularly tothe making of tbe joints between the )ipe sections, and has for itsobject to provi e means for seeling the sections together in enel'ective end expeditious manner.

in the annexed drawingslhaveillustretefl ihe invention in the liormwhich l consider y to exhibit the best inode of applying the inventionin practice, with special reference to concrete pipe oi tbe typedescribed in the prior patent. of Coleman Meriwether', No. 884,517,dated July 28, 1908, but l desire it A understood that the invention isnot limited to use with that particular kind of ipe.

Referring now to the drewings, *ignre l is a longitudinal section of aconcrete pipe, showing the circular band employed i'or closing the innergroove of the ppejOint. Fig. 2 is a cross section on line H-ll of Fig.l, showing also the elevice employed for forcine lastic or semi-li uidconcrete h into the joint-groove. Fig. '3 is a develop- :nent of eportionof groove--closing bend.

The pipe sections 1, 2, 3, illustrated in the drawings, are cylindrical:incl :ire provided with bell end spigot 7 ends formed in such manner asto leave sin undercut groove, es e, on the. in-sicie of the pipe whenilie sect-ions are assemble with the spigot end of one fitting into thebell end of its neighbor. Embedded in the pipe sections are suiieblemeslied reinforcing fabrics 5, which extend ont of the ends of thesections sind overlap each other in the seid grooves, es shownat 6, Fig.l. 'lbese grooves ere to be lllecl with concrete, which, embedding theover-- lapping reinforcements, serves tobiml the pipe sections rnilytogether.

designates e strip of resilient metal, preereblv sheet steel, curved toa more or less circol er form endl in circumferential ex- 'tent orlength equal to or very slight-ly less than the inner circumference of.the pipe in which it is to be used. This bend Z is provided with nplurality of apertures 8, preferably rectangular, and over esclieperturethe ber or plete 12,

lis e suitable closure, for sliding in guides or gibs 10. Fixed securelyet one end of the band is a member 11, and hinged t-heretcis e siiB beror plete 12, the free end of which is adapted to engage an inclined cammember 13 fixed on the other end of the band.

le designates c device in the nature of a force-pump, the cross sectionof which is the same', in shape, es the ormiof the apertores 8 (in thepresent case rectangular) the size of said pump device in cross Asectionbeing such that when inserted into one of.

the apertures and turned ouil ofthe radial position, :is shown in Fig.2, the device Will t the aperture closely and thereb prevent theleakage'or escape of the liqui or semiliquiai concrete with which thegroove is filled. Working in the casing or bod portion i5 of the cieviceis 16 the reciprocation of which fills the casing with material (bysuction) through the open forward, end of the casing or body portiopAendl expels the seme again.

The method. of using the devices described above is as follows: -A pairof pipe sections being assembled es in Fig. of the groove is packed withconcrete by ineens of e trowel or othey,1 suitable iin lement, to a.point about half way up the sides of the. pipe. The bend 'E' is nowplaced in position, with the apertures 8 over the unfilled part of thegroove end the bar l2 is forced irmly down against the member 13, theinclined face of which, cooperating with causes the bandzto be expancledagainst and into close conformity with the inner surface of the pipe.The puin device 14 is then filled with concrete 'whici is liquid enough.to [low and is inserted, in the manner shown in Fig. 1, .into theaperture nearest-to the concrete already in the roove at one side of thepipe. The piston is then pushed in, expelling thev concrete. IThe sizeof the pump or filling device is preferably so proportioned es to holdinst enough, or slightly more than enough, the aperture next to' lillthe groove up to above. When the concrete is Yseen at the level of thenext upper aperture the filling device is withdrawn enel the gateclosed, which can be e'ecte,"by the exercise of a little dexteritywithout the escape of mete-l rial through tbe aperture in which thelilling device hed been inserted. The-opcitations described ere repeatedup to the top example eplete 9 a piston or p anger 1, the lower part ofthe pipe, then on the other side of the pipe, and lastly the remainingspace at the center. As soon as the concrete has set s'uli ciently theband is loosened and stripped oi, leaving the inner suraceof the Joint'smooth and flush with the surface of the oiconstruction, but lconsidersuch changes to be Within the proper scope of the invention as dened bythe appended claims.

What I claim is: l. 'A resilient metal bandlor closing the innercircumferential groove at the joint of a sectional concrete pipe, incombination with means for expanding the band to close the-eiylfenmferential groove, said means lo cated entirely on said band andoperating to maintain Vthe metal band over the circumferential groove,said band having a plurality of perforations, and means for forcingconcrete through said perforations into the circumferential groove.

. 2. A. substantiallyeircular resilient metal band adapted to close acircumferential been found to groove on the inside of a pipe and whosecircumferential extent or length is suhstan" t-Ially equal to the innercircumference ot` the pipe in which it is to be used, said resilientband having means Wholly supported thereon and leaving the conduitsubstantially unobstructed for removably maintaining the same inposition and having per- 'orations therein in combination with means onthe interior of said conduit for forcing concrete or grout through saidband into the circumferential groove.

3. A limber band having disconnected ends and adapted to be placed overan in teriorl groove formed between individual sections of a conduit,said band comprising means on one end coperating with means on the otherto expand said band uniformly throughout its circumference intoconformity with said conduit and cause the same to engage the concretepipe at all oints adjacent said groove, said coperating means beingreadily disenga eable from each other and so located and o suchdimensions as to provide a' substantially unobstructed pas sage in saidconduit.

' In testimony whereof I afiix my signature in the presence of twosubscribingwitnesss.

JOHN C. MXTGHELL.. Witnesses: M. LAWSON Drain'.

S.S. DUNHAM. ri;

